Revert ""Clear all" button on recent apps"

This reverts commit 6471aee7bec8e8d2eb179db9605d3b6a12ac48f6.
Clear All Button to Recents (1/2)

Conflicts:
	core/java/android/provider/Settings.java
	packages/SystemUI/src/com/android/systemui/recent/RecentsPanelView.java

Conflicts:
	packages/SystemUI/src/com/android/systemui/recent/RecentsPanelView.java
RAM bar (1/2)
- This commit includes small re-sizes to fit transparency in new launcher

Thanks to @kufikugel for hole code ported from 4.3

Change-Id: If1341c1ad5614a1adca07358910a4df85c919966